Attic air sealing in Mission Viejo CA - gaps closed before the insulation goes in
Hot upstairs or drafty rooms? We seal the holes in your attic floor so the insulation above them can finally do its job.
What does attic air sealing fix, and is my attic ready for it?
Attic air sealing in Mission Viejo closes the openings through your attic floor, around pipes, wires, lights, the hatch and the tops of walls, with caulk, spray foam or solid blocking, so the air in your rooms stops leaking up into the attic. When an older vented attic is getting more insulation, those openings get sealed first, because once the insulation is down nobody is digging back through it to find them.
Most people call because one room never feels right, usually the one upstairs or over the garage, or because the attic is old and they don't trust what's up there. The price and the schedule both turn on how big and crowded the attic is and whether something has to be fixed or pulled out before we seal, like a roof leak or soaked old insulation, plus a permit if your job needs one. I'll give you your own number after I've been up there, on a written estimate that lists each step in the order we'd do it.
- Fully licensed and insured.
- Free quotes on site.
- Replies within 1 business day.
What attic air sealing looks like
How we handle attic air sealing
Insulation is great at hiding things, and that's the problem, so I go up first and check what's there before anyone seals anything. Then our installers pull back the insulation where the leaks are, caulk the small cracks, fill the wider gaps with spray foam and use high-temperature caulk anywhere near a heat source. Big openings like dropped soffits, the boxed-down ceilings over cabinets and tubs, get solid blocking, and hot flues get metal collars instead of foam. We seal the seams where the tops of walls meet the drywall, cover can lights that aren't rated ICAT, for touching insulation and staying airtight, and leave the vents that are meant to stay open alone. If you have a gas furnace or water heater, we suggest having its venting checked around the time we work.
Sealing is usually the first half of the job. Once the holes are closed, topping up the loose fill with retrofit insulation is usually the better buy, because it costs less and works well on a sealed floor. Spray foam insulation costs more and seals while it insulates, and I'll point you that way when your ductwork runs through the attic, since that's when it tends to earn its price.
Why Mission Viejo homeowners call Mission Viejo Insulation and Spray Foam to seal their attics
I write every estimate myself
I come out, look at the attic and write the estimate, then our installers do the work and I check it before we leave. You deal with the same person before and after, so nothing gets lost between the sale and the crew.
Fully licensed and insured
We're fully licensed and insured. That matters in an attic, where someone is working over your ceilings, around your wiring and next to your gas flues.
Checking attics first since 2023
I started this business in Mission Viejo in 2023 after learning the trade on an Orange County insulation crew, and we're known for checking the space before we sell anything into it. If your attic isn't ready to seal, I'll tell you so instead of covering up the problem.
Work built to local rules
Mission Viejo builds on the state's codes and amends them for local conditions, and California's energy code covers changes to existing homes as well as new ones, including indoor air quality. We're based in Mission Viejo and work in the Orange County cities around it, so we know the rules that apply at your address.
On this job the order matters most, because whatever we seal over stays there. Send us a note or call (949) 619-8030, and tell me about any roof leaks, old knob and tube wiring or bathroom fans that blow into the attic.
Get a step-by-step plan for sealing your attic
Send the form and I'll get back to you within one business day to set a time to come out. The estimate is free, done at your house, and there's no pressure to book.
- Fully licensed and insured.
- Free quotes on site.
- Replies within 1 business day.
What happens after you call about attic air sealing
Call or send the form
I answer, or I call you back and we pick a time that works for you. We take calls seven days a week, into the evening.
I look at your attic
I go up, check for anything that has to be fixed first and find where the air is getting through. You get a written estimate that lists each step in the order we'd do it, so you can see what's needed now and what can wait.
We file any needed permit
If your job needs a permit, we file it with the city or county office that covers your address and book the inspections. You don't have to chase paperwork or an inspector's calendar.
Installers seal, I check
Our installers do the sealing, then I go up and check it before we call the job done. I'd rather find a missed gap myself than have you find it.
Attic air sealing questions
What gets checked before my attic is sealed in Mission Viejo?
National guidance says a leaking roof, live knob and tube wiring and bathroom fans that vent into the attic have to be fixed before sealing starts, and we follow it. Old vermiculite, a pebbly gray-brown fill, can contain asbestos, so it should be tested by a professional before anyone seals or insulates over it. If I find any of these, the fix goes first on your estimate.
Which attic vents should stay open after air sealing?
Soffit, ridge and gable vents stay open, along with any duct that brings combustion air to a furnace or water heater, because they only work when air can move through them. We seal the attic floor, not the attic, and you're welcome to ask how we keep each one clear.
Is attic air sealing safe if I have a gas furnace or water heater?
It is when your gas appliances are venting the way they should, because a tighter house can let carbon monoxide build up when they aren't. ENERGY STAR advises having a heating and cooling technician check the venting on your furnace, water heater and dryer, so plan that visit around the time we seal.
How do I apply for a building permit in Mission Viejo?
The city takes every permit application and inspection request online, so you register and submit through its Client Self Service Online Portal, which you'll find on the city's building services page. Building Services is the office to ask whether your attic job needs one, and when it does, we file it and book the inspections for you.
How much does attic air sealing cost in Mission Viejo?
It comes down to how many openings your attic has, how much headroom there is to reach them and whether old insulation has to come up first. Covers over can lights, blocking over big soffits and any repairs that come before sealing add to it, while a roomy attic with clean insulation keeps it down. I'll put a number on it after I've seen yours.
How do I know if my attic has air leaks?
Dark, dirty patches on your attic insulation are the usual giveaway, because they show where air has been moving through it and leaving dust behind. Leaks tend to be worst where walls meet the attic floor, around dropped soffits and dropped ceilings, and behind or under kneewalls, the short walls in rooms tucked under the roof. From downstairs, a hot upstairs or a stuffy room over the garage is often the first sign.
Work that goes with attic air sealing
Retrofit insulation
Once the floor is sealed, building up the old layer is how the attic finally holds back heat.
Spray foam insulation
If your ducts run through the attic, foam handles the sealing and the insulating in one job, which is worth asking about.